This article provides a summary of significant events in 1820 in birding and
ornithology. Notable occurrences in 1820 include the first description of the
yellow-legged tinamou, and the commencement of ornithologist William John Swainson's Zoological Illustrations, a work including illustrations of many birds.
^Roberts TR (1993) "The freshwater fishes of Java, as observed by Kuhl and van Hasselt in 1820-23". Zoologische Verhandelingen285: 1-94.
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^Kuhl, Heinrich (1820). Conspectus Psittacorum : cum specierum definitionibus, novarum descriptionibus, synonymis et circa patriam singularum naturalem adversariis, adjecto indice museorum, ubi earum artificiosae exuviae servantur (in Latin).
^COSTA CORRÊA L, Silva D, Cappellari L (2016) Aves, Tinamidae, Crypturellus noctivagus noctivagus (Wied, 1820): Southward range extension and rediscovery in Rio Grande do Sul, Brazil. Check List 6(4): 585-586.
https://doi.org/10.15560/6.4.585